Allow remove repeated optional rules

Author: natanfelles

src/Validation.php

@@ -464,16 +464,17 @@ protected function validateRule(string $rule, string $field, array $args, array
      */
     protected function validateField(string $field, array $rules, array $data) : bool
     {
+        $removeKeys = [];
         foreach ($rules as $key => $rule) {
             if ($rule['rule'] === 'optional') {
-                $ruleKey = $key;
+                $removeKeys[] = $key;
                 if ( ! \array_key_exists($field, $data)) {
                     return true;
                 }
             }
         }
-        if (isset($ruleKey)) {
-            unset($rules[$ruleKey]);
+        foreach ($removeKeys as $removeKey) {
+            unset($rules[$removeKey]);
         }
         $status = true;
         foreach ($rules as $rule) {

tests/ValidationTest.php

@@ -527,6 +527,19 @@ public function testOptionalAsLastRule() : void
         );
     }
 
+    public function testOptionalRepeated() : void
+    {
+        $this->validation->setRules([
+            'email' => 'email|optional|optional',
+            'name' => 'required',
+        ]);
+        $status = $this->validation->validate([
+            'email' => 'foo@bar.com',
+            'name' => 'Jon',
+        ]);
+        self::assertTrue($status);
+    }
+
     public function testEqualsField() : void
     {
         $this->validation->setRule('password', 'minLength:5');